How many watts does a PCI-E 3.0 slot provide?

Hardware Hub Motherboards
1

Imagine plugging a GPU card without any 6 or 8 pin PCI-E connector.

2

http://www.brighthub.com/computing/hardware/articles/23289.aspx

3

About 75watt, but I wouldn't plan on using that 24/7 as some cheaper motherboards may have issues.

4

If the GPU doesn't require a 6/8-pin connector it should not be any problems.